具有^1-Sigma，^2-Sigma，^3-Sigma和^2-Pi电子基态的杂原子分子离子的转动冷却
Rotational cooling of heteronuclear molecular ions with ^1-Sigma, ^2-Sigma, ^3-Sigma and ^2-Pi electronic ground states
摘要：
在离子阱中，分子离子的平移运动可以通过与激光冷却的原子离子的库仑相互作用而被有效地同情地冷却到低于100 mK的平移温度。然而，预计转振自由度在平移冷却期间基本上不受影响。我们以前曾提出过一种方案，用于冷却这种在最简单的^1-σ电子基态分子情况下，内部冷而内部热的异质双原子离子的内部自由度。在这里，我们提出了一个显着的简化这些方案，并作出推广到最常见的电子基态的异质分子离子：^1-Sigma，^2-Sigma，^3-Sigma和^2-Pi。该方案依赖于一个或两个激光驱动的转变，可能包括一个定制的非相干远红外辐射场。
英文摘要：
The translational motion of molecular ions can be effectively cooled sympathetically to translational temperatures below 100 mK in ion traps through Coulomb interactions with laser-cooled atomic ions. The ro-vibrational degrees of freedom, however, are expected to be largely unaffected during translational cooling. We have previously proposed schemes for cooling of the internal degrees of freedom of such translationally cold but internally hot heteronuclear diatomic ions in the simplest case of ^1-Sigma electronic ground state molecules. Here we present a significant simplification of these schemes and make a generalization to the most frequently encountered electronic ground states of heteronuclear molecular ions: ^1-Sigma, ^2-Sigma, ^3-Sigma and ^2-Pi. The schemes are relying on one or two laser driven transitions with the possible inclusion of a tailored incoherent far infrared radiation field.
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